20512216559 has 2 divisors, whose sum is σ = 20512216560. Its totient is φ = 20512216558.

The previous prime is 20512216531. The next prime is 20512216561. The reversal of 20512216559 is 95561221502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20512216559 is a prime.

Together with 20512216561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20512212559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256108279 + 10256108280.

It is an arithmetic number, because the mean of its divisors is an integer number (10256108280).

Almost surely, 2^20512216559 is an apocalyptic number.

20512216559 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512216559 is an equidigital number, since it uses as much as digits as its factorization.

20512216559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 20512216559 in words is "twenty billion, five hundred twelve million, two hundred sixteen thousand, five hundred fifty-nine".